gcp-docker-image-mover.sh

#!/usr/bin/env bash

# According to this documentation https://cloud.google.com/container-registry/docs/managing you can move images
# but the gcloud command with add tag option will handle only one tag at a time
# The "if while for" magic will handle multiple tags by retagging the same image.

# Supported input which is provided by the list-tags command:
# 0.2.63
# 0.2.60;0.2.61
# 0.2.59

TAGS=`gcloud container images list-tags --format='get(tags)' [SOURCE_HOSTNAME]/[SOURCE_PROJECT-ID]/[SOURCE_IMAGE]`

while IFS= read -r imageVersion || [[ -n "$imageVersion" ]]; do
    if [[ $imageVersion == *";"* ]]; then
        while IFS=';' read -ra ADDR; do
            for i in "${ADDR[@]}"; do
                yes | gcloud container images add-tag [SOURCE_HOSTNAME]/[SOURCE_PROJECT-ID]/[SOURCE_IMAGE]:$i [DESTINATION_HOSTNAME]/[DESTINATION_PROJECT-ID]/[DESTINATION_IMAGE]:$i
            done
        done <<< "$imageVersion"
    fi
    yes | gcloud container images add-tag [SOURCE_HOSTNAME]/[SOURCE_PROJECT-ID]/[SOURCE_IMAGE]:$imageVersion [DESTINATION_HOSTNAME]/[DESTINATION_PROJECT-ID]/[DESTINATION_IMAGE]:$imageVersion
done <<< "$TAGS"